// OperatorFunctionCallNode.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;

using Irony.Compiler;
using Irony.Compiler.AST;

using Microsoft.Linq.Expressions;

namespace Bechamel
{
	
	public class OperatorFunctionCallNode : BechamelNode
	{
		AstNode left;
		string op;
		AstNode right;
		
		public OperatorFunctionCallNode(NodeArgs args, AstNode left, string op, AstNode right)
			: base(args)
		{
			this.left = left;
			this.op = op;
			this.right = right;
		}

		public override Expression GenerateExpression(ETGenerator generator)
		{
			Expression operation = ApplyOperator(generator);
			return Expression.TypeAs(operation, typeof(Object));
		}

		Expression ApplyOperator(ETGenerator generator)
		{
			Expression l = generator.GetExpressionFromAst(left);
			Expression r = generator.GetExpressionFromAst(right);

			if (op != "=") {
				if (l.Type == typeof(Object)) {
					l = Expression.Unbox(l, typeof(Int32));
				}
				if (r.Type == typeof(Object)) {
					r= Expression.Unbox(r, typeof(Int32));
				}
			}
			
			switch (op) {
			case "+" : return Expression.Add(l, r);
			case "-" : return Expression.Subtract(l, r);
			case "*" : return Expression.Multiply(l, r);
			case "/" : return Expression.Divide(l, r);
			case "=": return Expression.Equal(l, r);
			case ">=": return Expression.GreaterThanOrEqual(l, r);
			case "<=": return Expression.LessThanOrEqual(l, r);
			case "<": return Expression.LessThan(l, r);
			case ">": return Expression.GreaterThan(l, r);
			default: return null;
			}
		}
	}
}
